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[TechReport] AMD puts on the ritz with six-core Opteron demo

post #1 of 27
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AUSTIN, TEXAS — With Intel's Nehalem-based Xeons gathering like a storm on the horizon, AMD today gave the first working demonstration of its potential counterpunch: a six-core Opteron processor code-named "Istanbul." Istanbul is a fairly straightforward upgrade over current 'Shanghai' Opterons: a 45nm processor with 6MB of L2 cache that fits into a Socket F-style motherboards, only with six cores rather than four. As a result, the upcoming Istanbul-based Opterons will serve as drop-in upgrades for existing Socket F systems. The chips will take advantage of the same 2P, 4P, and 8P infrastructure as today's Opterons, with HyperTransport and two channels of DDR2 memory per socket.

AMD has previously stated that Istanbul processors will become available in the second half of this year, and the firm hasn't yet provided any more specific guidance about when to expect Istanbul-based systems. However, the presence of working silicon would seem to indicate that Istanbul Opterons could be introduced much earlier in that broad "second half" time-frame than originally anticipated.

AMD showed us several demonstrations of Istanbul silicon in action. The first was a simple showing of Task Manager on the Windows Server 2008 desktop, in which the utility showed activity indicators for each of the 24 cores in a quad-socket system.



The third demo was the most interesting for a couple of reasons. First, because it was intended to show how Istanbul can serve as a drop-in upgrade for Socket F systems. The only requirements: the system must support split power planes, and it must have a BIOS upgrade to operate with the new processors. Second, the demo was impressive because it included a performance test. Two otherwise-identical systems were situated side by side: one with a quartet of Shanghai Opterons, the other with four Istanbul chips. Both systems were running with HyperTransport 3 active—a capability coming soon to Shanghai Opterons but not yet available in current products. To illustrate the performance difference between the two boxes, the AMD tech ran a Stream benchmark. The 16-core Shanghai system produced throughput numbers in the range of 25,000 MB/s. The 24-core Istanbul box, by contrast, hit about 42,000 MB/s. The tech then swapped the processor-and-memory daughtercards between the two boxes, and of course, the performance characteristics moved with them.

That's one heck of an in-place upgrade, but the bigger question may be: Why the huge performance gain with the addition of more cores, given that Stream is typically considered, at least partially, a bandwidth-bound benchmark? And why the magnitude of the gain, with only 50% more cores and (although they were not disclosed) likely lower per-core clock frequencies for Istanbul?

Part of the answer, it seems, may be a feature new to Istanbul that AMD calls HT assist (presumably for HyperTransport assist). This feature is what the company calls a probe filter (and may more commonly be called a snoop filter) that functions to reduce traffic on socket-to-socket HyperTransport links by storing an index of all caches and preventing unnecessary coherency synchronization requests. Current Opteron systems use a broadcast-based probe protocol, sending probe requests to all sockets. Istanbul, instead, either knows that no probes are required or is able to do a directed probe to a single socket. (Although it may still use broadcasts in certain, specific situations.) Istanbul's probe filter stores its data in the processor's L3 cache. The amount of cache space dedicated to probe filter storage, AMD says, will be configurable in the BIOS, and the more space dedicated to probe filter storage, the more granular its operation will be.

AMD didn't handicap the exact performance impact of HT assist for us, but the quad-socket Stream test may have been an extreme case. The probe filter capability will be unique to the six-core Istanbul and will not be incorporated in a future revison of Shanghai. However, with fewer cores, Shanghai Opterons will be able to reach higher clock speeds within the same power envelopes as Istanbul, and AMD expects the clock frequency advantage to somewhat offset the lack of a probe filter. Regardless, one would expect Istanbul to be especially popular in systems with four or more sockets, where coherency traffic is a thornier issue and HyperTransport bandwidth is at a premium.

AMD plans a full lineup of six-core Opterons based on Istanbul, including low-power HE versions and high-performance SE models, all within the customary Opteron power and thermal envelopes. Although the percentage of server installations that take advantage of the drop-in upgrade opportunity is relatively small—AMD estimates it at around 5%—the firm hopes that tighter IT budgets and a strong value proposition might prompt a change in habits among some IT decision-makers. Beyond that, AMD expects system vendors to treat Istanbul very much like any other new Opteron speed grade, with a much easier qualification path than an all-new product. That should mean fairly quick and widespread adoption of six-core Opterons among vendors shipping Shanghai-based systems today, if all goes as planned.
source

Glad to hear good news about their progress with Istanbul.
Edited by Cheetos316 - 2/20/09 at 12:25am
    
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post #2 of 27
AMD's on a roll
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post #3 of 27
Yay for AMD!
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post #4 of 27
Good to see more good things are coming from AMD this year. Seems to me they're getting back on track after being hit really hard by Intel's C2D architecture.
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post #5 of 27
Very cool.
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post #6 of 27
Are these going to be native 6 cores or dual tri-cores?
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post #7 of 27
6 cores in one die.

now put that it into a desktop as soon as possible, double the cache, and amd's back on top. yeeehaaaa
   
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post #8 of 27
whau, i want this to desktop . Its compatible with AM3?Six core like good
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post #9 of 27
And this isn't even the year of the Dragon! Go AMD!!
(It's the year of the Boar) on the Chinese calender.
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post #10 of 27
This is good. Hopefully this will weather the storm when intel's monster i7 8 core machine hits the market. AMD needs to hold strong this year and gain ground, so when DDR3 pricing drops and avaiability and selection on intels new i7 platform starts to develop, they won't loose much next year. I don't like that AMD is going two years on their road map without any major architecture or innovations changes until Fusion in 2011. Hopefully this will do really well like the phenoms so far for the desktops.
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